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CONCISE   (28)   SHELL
( 8 cm Diameter )



The Back Side has a circular Reference Table:




CONCISE, Tokyo / Japan                                    (1960)
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S C A L E S  of the  CIRCULAR SLIDE RULE  » CONCISE (28) SHELL «
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   D       X                                    outer circle
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   C       X                                    inner circles
   CI      1/X
   A       X2
   K       X3

This Circular SR came in a black soft-plastic case  as a gift of
» SHELL PETROCHEMICALS «  -  It has NO MODEL NO.,  but the FRONT
SIDE is identical to  "MODEL 28"  of the  » PAN_AM «  Version.

The BACK SIDE has a Reference Table like  MODEL 28N  Version(A),
but here the CURSOR goes around.

                    Historical Remarks ...
impressum:
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©  C.HAMANN  http://public.beuth-hochschule.de/~hamann  12/12/12